Apparatus for forming glassware



May 23, 1950 G. E. ROWE 2,508,891

APPARATUS FOR FORMING GLASSWARE Filed May 4, 1946 l/ 87 89 In van for: 2 GeoqgeERowe a by W+ m 96 95 5 Attorneys.

fiaienteci May UNITED PATENT George'iE. Rowe Wthersfield; .Coiiit; assifioiw- Hartford-Empire Company, Hartford; Goiihz; a corporation of Connecticut 9 Claims; (01. ray-=29) a.

Q of Ah; olijedt" if 4 V I an improved Somme; fo'r" g' uidipg, positioning and operati-fig aploralitvof fires siog plfiirgers' in a sihle' apparatu s f iorm s ubsfintially simultaneously oi-plurality of-hollow glass gariso'n's or hollow bodies according: tothe general-- procedure above described, such improved structure'- being-- imirirov'e r n'o l xfiafi for simu taneously codlitig the inter of tire sievi r'ogl ressing 15km gers $6 to perm-ieiiiaividi'z'allv rgdla ble fc'o trolof the temperature of thiass cofitafetifi" mime-b 93cm H W U sembly of a perison forming unitingludmg g, pen

of vertical pressing plupgers together vvith im;

proved: means" for guiding; positioning end for operatin'g the plungereand for cooling them:

As illustrated in the drawing, an assembly of parts provided in accordance with the present invention may rest upon a supporting base l which may be the base of a complete glassware forming machine (not shown). A socket base member 2 of a beveled gear screw jack mechanism 3 stands upon the base I and is positioned and secured against displacements from a desired position thereon by any suitable means, as by the fastening devices indicated at 4 and 5, respectively.

The socket base member 2 rotatably supports the lower end of a vertically disposed jack screw shaft 6. Fastened to the shaft 6 is a bevel gear I which operatively engages a like bevel gear 8 secured to a crank shaft 9 which is rotatably supported at one end by the socket member 2.

A motor casting or block In of a dual-bore vertically disposed pneumatic motor is secured to a lower head member'jl having 2. depending tubular extension l2 which is internally threaded to receive the threaded upp r end of the vertical jack screw shaft 6. The arrangement is such asto support the casting H] in vertical position above the base i at a height which can be adjusted vertically within limits by rotating the crank shaft 9 of the jack mechanism.

With more specific reference to the constructionof the pneumatic motor, the casting I is bored from both ends to provide a pair of parallel upper pneumatic cylinders |3 and I4 and respectively aligned lower cylinders l5 and l6 which are Separated from the upper cylinders by an intermediate integral head IT. A top head l8 surmounts the casting l3 and acts both as the upper head of the cylinders l3 and M and also as the lower head or block for a holder H! for elements of guiding and positioning units for a pair of inverted pressing plungers 26. More particularly, the holder I9 is provided with a pair of cylindrical bores 2| and 22 axially aligned, respectively, with the pneumatic cylinders l3 and M of like bore.

Inasmuch as the plunger guiding and positioningunits are identical, the parts thereof hereinafter will bedescribed where possible with reference to a single unit.

'As illustrated in the drawing, each plunger guiding and positioning unit includes a hollow piston rod 23 having a pair of spaced upper and lower pistons 24 and 25 secured thereto so as to operate respectively in a pair of upper and lower pneumatic cylinders |3, |5, or l4, l6. A suitable hydraulic packing ring 26 is disposed between each piston 24 and 25 and the adjacent cooperating cylinder wall. Likewisehydraulic packing rings 21 are disposed between each piston rod 23 and the intermediate and upper heads l1 and H3.

The upper end of each rod 23 is secured to the lower end of a pressing plunger 20 having a tapered tip 28. Each plunger is enlarged at one or more places, as at 29 and 30, to provide bearing surfaces in close sliding contact with internal cylindrical walls 3| of plunger guides 32 mounted on the upper end of the holder l9. Each plunger guide 32 has an enlarged cylindrical bore 3|a at its upper end which isadapted to receive the lower end of a neck mold supporting ring 33 having an annular shoulder 33a supported on the guide 32. The rings 33 have internal cylindrical bores 33b of the same diameter as the plunger guides 32. Each ring 33 is provided at its top with a conical annular seat 34. Complementary portions'35 of neck mold 36 are adapted to fit the annular seats 34 accurately when the neck molds 36 are brought to operative positions with respect to their respective plungers 20. The neck molds 36 may be formed of half sections, as is usual, such half sections being carried and operated by suitable holders, not shown, such for example as those of the Hartford-Empire I. S. forming machine, as disclosed in the Ingle Patent No. 1,911,119, granted May 23, 1933. The neck rings on molds may operatively support thimbles 36a.

Each neck mold 36 is designed to cooperate with a body mold 3! and, like the neck mold, may be formed of cooperating halves supported and operated by suitable structural parts, not shown, such, for example, as those provided for the blank mold halves in the aforesaid Ingle Patent No. 1,911,119. Each body mold 31 may be locked to its aligned neck mold 36 when the body mold halves are closed about the closed neck mold. The cavity within each body mold 31 is temporarily open at its top to permit downward passage of a charge of molten glass after each mold cavity is closed at its top by suitable bottom plates or baflles 38. The latter may be supported and moved operatively in timed relation with the movement of the other parts of the parison forming units by structure such as disclosed for that purpose in the Ingle Patent No. 1,911,119.

Each mold set consisting ofa plate 38, body mold 31 and neck mold 36 is secured together in alignrnent by their engaging portions as is usual in the case of glassware forming machinery of the type disclosed in the Ingle patent. When both of the neck mold and thimble assemblies are disposed upon the upper end of their respective plunger guides as shown in the drawing, accurate alignment of such assemblies with their respective plunger guides and hence with their respective cooperating pressing plungers 26 may be secured and maintained by the use of suitable locking means, such for example as that disclosed in my aforementioned copending application, Serial No. 410,747, filed Sept. 13, 1941.

Each plunger 20 includes a spanner annulus 39 including spaced spanner holes by means of which each plunger may be unscrewed from itsrod 23 and thereafter replaced by a plunger of different tip configuration or size to conform to different neck and parison molds.

A spring-pressed sleeve'40 surrounds the upper portion of each rod 23 within the cylinder 2| or 22 and is integral with or joined in any suitable manner to a plunger lifting disk 4|.

A coil spring 42 surrounds each sleeve 40 between the fianged upper end or lifting disk 4| and a stationary thrust ring 43 which is located in the bottom of each cylinder 2| or 22. Each rod 23 is milled flat along a longitudinal portion to provide a vertical guide fiat 44 which cooperates with an internal parallel surface (not shown) in the sleeves 41) to prevent rotation of the rod relative to the sleeve. An ear 4|a projects from each disk 4| and cooperates with vertical grooves Zia and 22a to prevent rotation while permitting vertical reciprocation of the sleeves 40. Rotation of the rods 23 thus is prevented and each plunger 20 may be unscrewed from its supporting rod, as by means of the spanner ring 39.

A single vertically adjustable stop screw 45 threaded through the upper portion of the guide casting 32 intermediate the two plungers 23, 26 provides a common stop for a contact 46 riveted or otherwise secured to the flange 4| of each sleeve 40.

filungertoperatinoipxorisiom Whenever the p essure. within t e. ylinder 1. 3,, h 1 above: ev a o p sto 2 on. e t er. o h iston. ods 23.. 23 is. reli ed; ee rine 41*. as oci t with that. ed, acts to.

the s e ve 40, the disk 4.! and t plunger a u t ntil: he sl ev conta t t k the. stop screw 45. This will dispose the tips of both plungers 2t, 2?] in their glass charge re eiv n posit on Th pos on; or a h. plu g r. ha at which e p un er. ihitiallr contacts the glass charge when. themold is harged or oad d:

The limit o h p e i troke o e h plunger lis de e mined b heela s o each eha sees. s ch. e.1a s.ispressed o o m th hollow DQQY. cf eehepe desired; Th exte na o figuration, of h s hollow body is fi ed y. the onfi u ation o he. gl ss m l w l sq h avity he a semb ed y d.- 3: c osu member 38, and'neclemoldSS. The internalconfiguration of the hollow glass body is determined y h s ap of e. Porti n i the p essin r uue r n c nta h hee aes t the o h pr ssing s k y v r at oni the w ight o he r e rom the exactweight desired is refiectedin the thickness of the wall or the hollow alticle. It is desirable that the charges shall be of exactly the nredete m hedweie t ut nae e n eetice it may not be possible to, continuously main tain this desirable condition and slight weight variations are sib h e at Po i ion or the two plungers 20, 20 at the end oi -their. pre ing strokes may vary slightly "according; to variations in weight of the charges that" have been pressed. I have found it desirable to 0011-. trol the supply of fluid pressure to the set of pistons for each plunger actuating rod '23 separately. Accordingly, the operating pressure fluidis supplied separately to the pairs of pistons 24, 25 through separate delivery, lines 48' and 49 controlled respectively by separate valves 56' and As. is illustrated in the drawing, the pressure fl d e ivery 1 ne di ides into tw branch delivery lines 48a and 48b, theformer eornrnuni cating with the interior of' the left-hand upper cylinder l3, and the latter communicating with the; interior of. the left-hand lower cylinder I5, at thebottorns thereof. The valve 50 which C011, trolsthefluid pressure line 48' comprises av casiigg 52in which is disposed a slide:va1Ve-.mem-. 5,3 constructed and arranged to. provide, in osition of the member 53, communication be ween. a pr ssure fluid suppl ine .5 7 and the pressure fluid delivery line 48 and to shutoff communication between an exhaust line-55and a pre sure flu d re u i 56 w ch. comm n cate wi h ne 48. The valve m e 5.3. ovides om n ati be w h etu n pihe fi and the exhaustline 55 and shutsofi communication-be ween h ine 54 and he p eur i i deliver line48 when valve member 53. is in another-- position in the valve casing. A valve stem ilpr i cts from one endof. the-valve cas ngand is pr ss d a e-i st a am .1w a sp ng-59; lo ated hetwe nthe valve m m er; 3; and the valvezcase ins... When. th s m isn he h h part. oi. the cam it.- as, sh w he. valv m mb r 5.3 isin. its firs deseribedposit ohi t e cas whereatiiuid is upplie o. theeylinders 3 a d 5 t r e the Part thaeam the va e 5.3 will he.- ih; its r-sec: 0nd or exhaust position whereat; fluiq i gig,

t erei Wh n he st mi'l. is. onthelcw.

6* chewed; from; those cylinders; A; throttle valve;

60 in line 48 provides means for throttling. the, dew. of; pressure ifluid. to the cylinders.

The -valvestructure shown: injheidrawing; and

asdescrlbesi z intended to represent any suite ahle -valvestrilctureaudits:operatingmechanism. actual ractice, the. valve controlling. the

supplvand exhaust chain or other: pressure. fluid to. and, from the; lower Damon the cylinders.

and ll 5 and: operatin meehanism, therefor prob.- ably. would he :similar: 120..th058 whichzare. in.- cludedin. the Hartford-Empire IeSi forming. ma-

chine and are. disclosed in. the aforesaid, lngle.

Patent 1,911,119.

As: illustrated in the": drawing, the. timing. oi

the upward stroke or the: twov plungers to, 20: is independently.- controlled as lsthe throttling-of: the pressure fluid: for efiecting their separate:

strokes. To thisend, the pistonsi l, 25 operat-ing; in the right hancr cylinders It, iii are raised: by fluid pressure from the. supply. line 541 through theseparate cam actuated valve 5 E; de-

livery line49', Miaand 49b, and: throttle valve the piston rod23 makespossliole. the use-oi smaller pistons than would be necessary to apply the same power-to; the movementof the: plunger, thus mak nehossi lethe assembly of. a. double plun operatingmechanism having a, cross section con siderably smaller, than. wouldbe. necessary if a single P ston motor were used, for each plung r- In order to retract the plungers 2t, 20 from.

their upper. or pressing, positions. 61, 6| to. their. lowermost or fully, ret ac ed positions, motor; c ntrol.- me hanishi is provided. includin a ,valve .3 which. ssimilar: inconstruction-a d m de o operation to the valves 50 and-151e, Thavalveiit; onerati lv onn ted: wi h b a ch-Ma th p ess re fiu d-supn yfli efli. Atitss e pposi e its-connect on h thebrauehfl. h valve 6 c0hhected.-:. by a p essure, luid; delivery nine, 65,

w th as ag s 5, .6 6.8.- audits.which esp etive y ommunicate i h; th lunnerpa o hecylinders: [3,14, l5 and; [6, A pressuliefillidreturn branch. 16 0i the1pil e65; communicateswiththe valve 63: at nedether ofaud anexhaustpine 1| commun ates w ththe valvefii atla n1ace. opp site he; onnection. t such-.- va vewith the p pe 65- heer aneemehtis suchthatr essure fluid will pass simultaneously; item the-line. 5.4.: thr u h the al e 63th; theuhher. end ofieach 0f-thecy1inders:-

13,14, l5 and I6" when the stem 12 of a spring press d alv member. .13; the va1ve.63. on

he hi h p rt. o acam 16:... Exhaust orpressure fiuidfromthe upper part .of each: of: the cylinders throu h: partoi thelineii, return line 10; valve.- taand exhaust-lineqlktakes place whenthe stem- 12:71.; on: the. low. partofx'the cam H. As inthe case of the valves 50 and 5|, the valve fiinandiits.

operatin meehapismare: representative of: any

su table structure. such, for example; as thatv lii hiiseineluded in the; Hartford Empiret I. S:

The provision of multiple pistons spaced along clearance position of the plunger. This may be the position for the plunger shown in full lines in the drawing. When each plunger reaches its charge receiving position 4'! during its downstroke, its butt end will contact with the upper edge of its sleeve-lifting disk 4|. Each disk 4| isheld at this time in an elevated position by the action of its spring 42 which has forced the disked sleeve El! upwardly until its flange contact 36 is against the adjustable stop screw 45. downward movement of the plungers 2t, '20 in responseto the actuation ofpthe pistons 24, 215 by the pressure fluid in the upper part of the cylinders in which they operate, will cause the plunger lifting disks 4| and their integral sleeves 40 to move downwardly against the resistance of springs 42, 42, which are thereby compressed, until these parts reach the positions shown by the full line in the drawing. This, as aforesaid, is the position of the plungers at which ample clearance is provided for bodily movement of the neck molds from the plungerguides to transfer the hollow parisons to laterally spaced stations for further forming treatment or for any other useful purpose. The parison transfer movement of each neck mold may be a bodily swinging movement thereof along an arcuate path such as is disclosed in my aforementioned cop'ending application, Serial No. 410,747.

Plunger cooling provisions Eihcient formation of successive charges into hollow glass parisons is aided if the glass contacting portion of each of the plungers 20 is maintained at a temperature which is most suitable for the purpose and is as nearly uniform throughout its glass contacting surface as can be obtained. The invention provides means for simultaneously cooling the plungers internally to individually regulable extents, whereby the temperature of each plunger can be effectively regulated and controlled. 4

As shown in the drawing, a liquid discharge pipe is provided in an axial bore 16 of each plunger 28, 20 and extends from the lower part of each plunger nearly to the tip of the latter in slightly spaced relation with the wall of each plunger bore 76. The lower part of each plunger bore may be enlarged at T5 to provide a drainage chamber which has inclined drainage passages Iii in the butt end of the plunger around the connected end portion of the piston rod. Each discharge pipe I5 may be threaded into the bore of a piston rod 23, the latter being hollow as indicated at I9. The drainage passages l8 discharge into the interior of the cylindrical holder bores 2|, 2| which are connected by a common well 88 so that liquid discharged from the passages I8.of both plungers 2|], 20 may drain to a common reservoir at the bottom of the holder bores and be gravity drained therefrom by a single drain pipe 8|. The latter may lead to any suitable place .at which the liquid is to be delivered.

A coolant such as water is supplied through a pair of stationary tubes 82, 82, each of which is secured to the lower head II nd extends up-' Furtherwardly through a packing 83 in the lower part of a reciprocable piston rod '23. Each tube 82 is closed at its lower end by a plug 84 or by any other suitable means. A lateral intake port 85 in each.

tube 82 communicates respectively with liquid supply passages 8t and 8? in the lower head mem ber ii. Separate liquid delivery pipes 88 and 89, each having its own throttle valve 90 or 5|, re spectively, connect the supply passages 88 and 81 with a pipe 92 leading from the delivery port 93 of a cooling liquid control valve 94. A cooling liquid supply line is connected with the valve 9 3 and includes a flow regulator 96.

The valve 94 includes a movable valve member 91 cooperative with a valve seat 98 in the valve to permit or prevent communication between the supply line 95 and the delivery xpOIt 93, according to the position of the valve member 91. A spring 92 tends to maintain the valve member 9'! on its seat 98 so as to shut off flow of coolant to the plunger 20, 26. The valve member 9'! has a stem lilo extending through a, packing IiiI into operative contact with a cam I02. Rotation of the cam W2 is preferably timed to unseat the valve .7 member 9! simultaneously with the upward or pressing movement of one or both plungers 20. This may be at the time one or both valves 5! 5! are actuated to supply air to the cylinders I3, I5, and I4, l5, beneath the pistons 24, 25.

The plunger cooling means described may be used to supply an individuall throttled stream of cooling fluid, such as water, to the interior of each plunger 20. In some instances Where less cooling will suffice, a coolant having a lower cooling value, as air, may be used. Spent cooling fluid may drain or exhaust from the plungers through the continuously open outlet passages 78 in the lower end portion of each plunger. The amount of cooling liquid may be regulated for both plungers by the regulator 55 and for the individual plungers by the throttles 99, 9|. It has been found in actual practice that this mode of cooling permits effective control of the temperature of the glass contacting portion of each plunger. The cooling arrangement and mode of use also make the cooling passages of the plungers self-cleaning.

A11- for puff blowing and other uses The improved multiple-plunger operating mechanism of the present invention also includes means for supplying air under pressure to the interior of the forming units or to the interior of the hollow glass parisons therein, if desired.

- As shown in the drawing, an air supply passage IB'Za is formed in a wall of the guide casting 32 and communicates through an annular passage IE3 in the guide 32 with the space within each guide wall 3|, ring support 35 and neck mold 36. Air may be supplied to the passage IBZa and thence to the communicating passage I83 at an appropriate time for an air delivery line I04 under the control of a valve I85. The latter may be actuated by a cam IE6, as in the caseof the valves 59 and 5|, so that air from a source of supply, indicated by the line Illl, may pass through the valve I05 when the stem I98 ofv a valve member I09 in the valve N35 is on the high portion of the cam I68. Communication between the lines IE4 and It! is shut off by the valve I35 when the stem I08 is on the low portion of the cam. If desired, provisions similar to those shown for the valves 50, 5| and 63 may be made for exhausting air from the communicating passages'IIlZa, I03.

In "actual practice, the valve 1-05 controlling the-supply 'of air tdand through the' passages 1 02a, 1'03, etc., preferably would be constructed and controlled as disclosedin theaforesald Ingle Patent- 'No.- 1,911,119; The-valve structure shown is-intended to representanysuitable valve structure forcontrolling the'supply-of air under pres- :sure' for "puflf" blowing of p'ar'ison's that have been formed inthe forming unit or for 'any'other useful purpose.

In practice, it maybe-desirable to-applyair' to the hollow 'parisons at or immediately after the withdrawal of the plungers 20; "20 to prevent S'bickifig of any portion-=01 the glass to the-plungers, to prevent collapse of any portion of the pa'risons or even toexpan'd them slightly.

It will be-understoodthat the invention is not limited to the "exact details of the structure shownin the drawing and hereinbefore specifieailydscribedas various modifications thereof ipo'se theini'n axial-allgnment-tvith said inverted ssmolds withthe r tips upp'ermo'st and to j've each of themupward from a lowermost, ld' clearance position of its tip to a higher i tial glass charge contacting'and supporting pos'ititin'within apress mold, thence to a" still higher position within its press mold topress the glass of a charge on each plunger tip against the internal walls of its press mold to form a body therein, each of said plungers being of sufficient length to extend upwardly within its inverted press mold from the lower end of the latter for the greater part of the length of the cavity of said mold when the plunger is at its glass pressing position in said press mold, and finally downward past said second named position to said lowermost, mold clearance position, said operating means comprising a pressure fluid motor including a rod for each plunger operatively connected to that plunger, means for operating said pressure fluid motors to move each plunger individually from said initial glass charge contacting and supporting position upwardly to said still higher position within the press mold and thereafter simultaneously move all of said plungers downwardly to said lowermost, mold clearance positions, and resilient means rendered effective by the downward movement of each plunger to said lowermost, mold clearance position to move each plunger upwardly to said initial glass charge contacting and supporting position.

2. In glassware forming apparatus, the combination of a pair of parallel inverted press molds located at a glass charge pressing station, said molds being open at their lower ends, a pressing plunger for each mold, pneumatically operated means operatively connected to the plungers to move them vertically in co-axial relation with their respective press molds from a mold charge initial contact position in each of said press molds to a higher charge pressing position therein and thence downwardly past said initial contact position to a still lower, mold clearance position, said plungers being of sufficient length to extend up wardly within said inverted press molds from the -low'er 'ends of'the latter nearly to the upper ends of theinterior thereof when said plungers are at their said glass pressing positions, valve means "associated with the pneumatic means for separately" eflecting movement of said plungers to their pressing positions, valve means for simultaneously'effectin'g retraction of said plungers,

and other means acting automatically after each downward movement of the plungers by said pneumaticallyoperatedmeans to said mold clearance positions to move said plungers upward to their said glass charge initial contact positions.

, '3'.-In glassware forming apparatus, the combination of a plurality of inverted press molds located at a glass charge pressing station and open at their lower ends, apressing plunger for each mold, pneumatically operated means operatively connected to saidplungers for individually moving them vertically in co-axial relation with said press molds from mold charge initial 'contact positions in said press molds to higher charge pressing positions therein and for simultaneously moving them downwardly past said initial contact positions to still lower mold clearancepositions, other means acting automatically after each downward movement of the plungers by said pneumatically operated means to said mold clearance'position to move said plungers-upward to their said mold charge initial contact positions, and means for adjustably limiting the extentof upward movement of said-plungers from said moldclearance'positions by saidother means to adjustably control the level within the press molds at which the upper ends of said plungers will be-located when saidplungers have been raised to their said glass charge initial-contact positions;

4. In glassware pressing apparatus, a plurality of spaced parallel pressing plungers, a plurality of pneumatic cylinders for each plunger co-axially aligned with that plunger, a pressing mold for each plunger in axial alignment therewith, a piston rod for each plunger reciprocable in the coaxially aligned cylinders for that plunger, a piston in each of said cylinders operatively connected therein to said piston rod, means for supplying and exhausting fluid under pressure to and from the opposite ends of the cylinders to effect reciprocation of said pistons therein, including means for regulating the flow of said fluid to the cylinders for the several rods so as to effect separate actuation of each rod in one direction and simultaneous actuation of all of the rods in the opposite direction.

5. In glassware pressing aparatus, a plurality of spaced parallel pressing plungers, a plurality of pneumatic cylinders for each plunger co-axially aligned with that plunger, a pressing mold for each plunger located in axial alignment with that plunger, a piston rod for each plunger reciprocable in the co-axially aligned cylinders for that plunger, a piston in each of said cylinders operatively connected therein to the piston rod, means for supplying and exhausting fluid under pressure to and from the opposite ends of the cylinders to effect reciprocation of said pistons therein, including means for regulating the flow of said fluid to the cylinders for the several rods so as to efiect separate actuation of each rod in one direction and simultaneous actuation of all of the rods in the opposite direction, a holder having a plurality of open topped cylindrical bores, each bore having a plunger in substantially concentric relation therewith, plunger positioning means disposed within each holder bore, said positioning "means for each plunger including a vertically movable cylindrical sleeve reciprocable vertically in its holder, a coil spring acting when compressed to urge said sleeve upward within said holder bore, a vertically adjustable stop member for limiting the upward movement of all of the sleeves in said holder, and a vertically movable plunger .from said lowermost position on exhaust of air from the upper part of the pneumatic cylinders .associated therewith.

6. In glassware forming apparatus a plurality of glass pressing plungers, individual fluid motors for said plungers operatively connected thereto,

independently regulable means individual to said motors to supply operating fluid thereto to efiect movement of said plungers independently of one another in one direction and means common to all said motors to supply operating fluid thereto to effect movement of said plungers simultaneously in the opposite direction.

7. In glassware forming apparatus a plurality of internally fluid cooled glass pressing plungers, individual fluid motors for said plungers operably connected thereto, independently regulable means individual to said motors to supply operating fluid thereto to effect movement of said plungers in one direction, means common to all said motors to supply fluid thereto to effect movement of said plungers in the opposite direction and means to regulably control the distribution to each of said fluid cooled plungers of a regulated total amount of cooling fluid.

8. In glassware forming apparatus, a plurality of internally liquid cooled juxtaposed, inverted glass pressing plungers, means for effecting successive reciprocation cycles of said plungers, means for simultaneously supplying cooling fluid to said plungers during a portion only of said cycles, and means for efiecting independent regulation of the distribution to each plunger of a regulated total amount of cooling fluid.

9. In glassware forming apparatus a plurality of internally liquid cooled juxtaposed, inverted glass pressing plungers mounted for vertical reciprocation in a housing, means for effecting successive reciprocation cycles of said plungers,

. means for simultaneously supplying a predetermined total amount of cooling fluid to said plungers during a portion only of each cycle, a common well in said housing into which spent cooling fluid from said plungers drains, and means for independently regulating the cooling fluid supplied to each of said plungers.

GEORGE E. ROWE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Rowe July '7, 1943 

